It took thousands of years to form the Grand Canyon. What MOST LIKELY caused the formation of the canyon? A) glacial drift
B) an earthquake
C) a rushing river
D) tectonic plates

The correct answer is option C, a rushing river
Explanation:
Canyons are formed as of the erosional activities of both wind and water affecting a huge plateau, mountain or hill. These plateaus, mountains, and hills are formed due to tectonic movements.
During the course of time, snow on the plateau melts and pull down half a million tons of sediments along with it. This sediment carrying river cuts the plateau thereby forming the Canyons

D. subjects and predicates : )

Are you asking for a opinion ? if so i believe that a speaker should be genuine and honest about what they're saying and should be factual